FAST O2 Sensor Bosch LSu4 WidebandThe Bosch LSU4 Oxygen Sensor is widely used in the FAST product line. Finding its way into the FAST EZ EFI Fuel, EZ EFI Fuel + Igniton as well as the XFI Sportsman and even the FAST Air Fuel Meters, the LSU4 is accurate, durable and essential to the operation of a number of FAST products. Catalog User 1
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